Unfortunately I chose Airtel for lts service.
I am using Airtel 4g for 2 weeks and I got 4g speed only once.
Look screenshot for proof. Max I get on 4g is 400kBps download speed. I had used reliance 3g for past 2 years and connection speed on reliance never dropped from 1.2MBps.
Never buy Airtel they have the worst customer service and internet plans and connections of all time. Moreover it gets disconnected every now and then. If you want to play online game, never use Airtel.